284 
GAMMARIDiE. 
AMP HIP OB A. 
NATATORIA. 
GAMM ABIDES. 
Genus— STIMPSONIA. 
Stimpsonia. Spence Bate, Cat. Amph. Brit. Mus. p. 162. 
Generic character. Superior antennse shorter than the in- 
ferior, furnished with a secondary appendage. First pair of 
gnathopoda robust, with the carpus large, and armed with a 
strong bent spine. Second pair of gnathopoda chelate. 
This genus probably bears too close a resemblance 
to Microdeutopus to be retained as generically distinct ; 
but the superior antennae, instead of being longer than 
the inferior, are very much shorter. The first pair of 
legs are longer than the second, and are complexly 
chelate ; the second pair are small and chelate, and the 
wrist is greatly elongated. The posterior pair of legs are 
longer than the preceding. The posterior pair of caudal 
appendages are double-branched, and the central tail- 
piece is conical. 
The name given to this genus is in compliment to the 
distinguished naturalist of the United States’ Exploring 
Expedition to the North Pacific, and to whom we wish 
here to record the obligation that we are under, both for 
information and specimens of various species described 
by him. 
